There are
401 mi
from Rio Rancho, NM to Fountain Hills, AZ
That's the driving distance. It would take 7 hours 38 mins to go from Rio Rancho, New Mexico to Fountain Hills, Arizona.
The flight distance (direct flight from Rio Rancho, NM to Fountain Hills, AZ) is 310.45 mi.
401 mi = 645.64 kms